Swimming in Sri Lanka in september 2025 Sea temperature by city in september
Do you want to go to the beach in Sri Lanka in september 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september in Sri Lanka by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Sri Lanka in september 2025
Here, find the average sea temperature in Sri Lanka in september in several coastal cities.
West Coast in september
83°F
min: 80°F / max: 84°F
83°F
min: 81°F / max: 84°F
82°F
min: 80°F / max: 84°F
Dehiwala-Mount Lavinia
83°F
min: 80°F / max: 84°F
Panadura
83°F
min: 81°F / max: 84°F
Southern Coast in september
83°F
min: 81°F / max: 85°F
83°F
min: 82°F / max: 85°F
83°F
min: 82°F / max: 85°F
Ambalangoda
83°F
min: 81°F / max: 85°F
83°F
min: 81°F / max: 85°F
Hambantota
83°F
min: 82°F / max: 85°F
North in september
85°F
min: 83°F / max: 86°F
85°F
min: 83°F / max: 87°F
Mannar Island
83°F
min: 81°F / max: 85°F
Kayts
85°F
min: 83°F / max: 86°F
Point Pedro
85°F
min: 83°F / max: 86°F
Poonakari
85°F
min: 83°F / max: 86°F
East Coast in september
85°F
min: 83°F / max: 86°F
84°F
min: 83°F / max: 85°F
84°F
min: 83°F / max: 85°F
Akkaraipattu
84°F
min: 83°F / max: 85°F
Arisimale Beach
85°F
min: 83°F / max: 86°F
Arugam Bay
84°F
min: 83°F / max: 86°F
North West in september
82°F
min: 80°F / max: 85°F
82°F
min: 80°F / max: 85°F
Kalpitiya
82°F
min: 80°F / max: 84°F
Where should you go swimming in Sri Lanka in the month of september?
Swimming in Sri Lanka in september is ideal
In september in Sri Lanka swimming conditions are generally the same everywhere.
In september in Colombo, Galle, Jaffna, Trincomalee, Batticaloa, Chilaw, Kalutara, Mullaitivu, Negombo, Yala National Park, Pottuvil, Puttalam, Tangalle, Akkaraipattu, Ambalangoda, Arisimale Beach, Arugam Bay, Bentota, Hambantota, Hikkaduwa, Mannar Island, Kalkudah, Kallady Beach, Kallara beach (Thiriyai), Kalmunai, Kayts, Matara, Mirissa, Navalady, Okanda, Point Pedro, Poonakari, Thalayadi, Unakuruwa Beach, Uppuveli, Vakarai, Dehiwala-Mount Lavinia, Kalpitiya, Panadura and Weligama, swimming conditions are perfect! With water reaching a maximum of 84°F and an average of 83°F, going in the water (and staying there!) feels great.
Where to go swimming in Sri Lanka in september: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in september
Colombo
| September | |||
| Average sea temperature | 83°F | ||
| Minimum sea temperature | 80°F | ||
| Maximum sea temperature | 84°F | ||
| Average outside temperature | 85°F | ||
| Maximum outside temperature | 86°F | ||
| Minimum outside temperature | 83°F | ||
| Precipitation | 18.6in | ||
| Number of days of precipitation | 20 jour(s) (67%) | ||
| Cloud cover | 56% | ||
| Our opinion | ideal swimming |
More information on swimming in Colombo in september
Galle
| September | |||
| Average sea temperature | 83°F | ||
| Minimum sea temperature | 81°F | ||
| Maximum sea temperature | 85°F | ||
| Average outside temperature | 83°F | ||
| Maximum outside temperature | 85°F | ||
| Minimum outside temperature | 81°F | ||
| Precipitation | 19.4in | ||
| Number of days of precipitation | 20 jour(s) (67%) | ||
| Cloud cover | 51% | ||
| Our opinion | ideal swimming |
More information on swimming in Galle in september
Jaffna
| September | |||
| Average sea temperature | 85°F | ||
| Minimum sea temperature | 83°F | ||
| Maximum sea temperature | 86°F | ||
| Average outside temperature | 85°F | ||
| Maximum outside temperature | 85°F | ||
| Minimum outside temperature | 83°F | ||
| Precipitation | 6.3in | ||
| Number of days of precipitation | 9 jour(s) (28%) | ||
| Cloud cover | 32% | ||
| Our opinion | ideal swimming |
More information on swimming in Jaffna in september
Trincomalee
| September | |||
| Average sea temperature | 85°F | ||
| Minimum sea temperature | 83°F | ||
| Maximum sea temperature | 86°F | ||
| Average outside temperature | 88°F | ||
| Maximum outside temperature | 94°F | ||
| Minimum outside temperature | 83°F | ||
| Precipitation | 4.8in | ||
| Number of days of precipitation | 6 jour(s) (21%) | ||
| Cloud cover | 31% | ||
| Our opinion | ideal swimming |
More information on swimming in Trincomalee in september
Batticaloa
| September | |||
| Average sea temperature | 84°F | ||
| Minimum sea temperature | 83°F | ||
| Maximum sea temperature | 85°F | ||
| Average outside temperature | 88°F | ||
| Maximum outside temperature | 92°F | ||
| Minimum outside temperature | 85°F | ||
| Precipitation | 6.9in | ||
| Number of days of precipitation | 11 jour(s) (38%) | ||
| Cloud cover | 28% | ||
| Our opinion | ideal swimming |
More information on swimming in Batticaloa in september
List of coastal cities in Sri Lanka
| Colombo in september | ideal swimming |
| Galle in september | ideal swimming |
| Jaffna in september | ideal swimming |
| Trincomalee in september | ideal swimming |
| Batticaloa in september | ideal swimming |
| Chilaw in september | ideal swimming |
| Kalutara in september | ideal swimming |
| Mullaitivu in september | ideal swimming |
| Negombo in september | ideal swimming |
| Yala National Park in september | ideal swimming |
| Pottuvil in september | ideal swimming |
| Puttalam in september | ideal swimming |
| Tangalle in september | ideal swimming |
| Akkaraipattu in september | ideal swimming |
| Ambalangoda in september | ideal swimming |
| Arisimale Beach in september | ideal swimming |
| Arugam Bay in september | ideal swimming |
| Bentota in september | ideal swimming |
| Hambantota in september | ideal swimming |
| Hikkaduwa in september | ideal swimming |
| Mannar Island in september | ideal swimming |
| Kalkudah in september | ideal swimming |
| Kallady Beach in september | ideal swimming |
| Kallara beach (Thiriyai) in september | ideal swimming |
| Kalmunai in september | ideal swimming |
| Kayts in september | ideal swimming |
| Matara in september | ideal swimming |
| Mirissa in september | ideal swimming |
| Navalady in september | ideal swimming |
| Okanda in september | ideal swimming |
| Point Pedro in september | ideal swimming |
| Poonakari in september | ideal swimming |
| Thalayadi in september | ideal swimming |
| Unakuruwa Beach in september | ideal swimming |
| Uppuveli in september | ideal swimming |
| Vakarai in september | ideal swimming |
| Dehiwala-Mount Lavinia in september | ideal swimming |
| Kalpitiya in september | ideal swimming |
| Panadura in september | ideal swimming |
| Weligama in september | ideal swimming |